Fix AppImage tool path

cmake/linux/package_linux.sh.in

@@ -52,7 +52,7 @@ fi
 echo -e "\nWriting verbose output to \"${LOGFILE}\""
 
 # Ensure linuxdeployqt uses the same qmake version as cmake
-export PATH="$HOME/bin:$(dirname "@QT_QMAKE_EXECUTABLE@")":$PATH
+export PATH="$(pwd -P)/squashfs-root/usr/bin:$(dirname "@QT_QMAKE_EXECUTABLE@")":$PATH
 
 # Fetch portable linuxdeployqt if cache is older than $DAYSOLD
 echo -e "\nDownloading linuxdeployqt to ${LINUXDEPLOYQT}..."